Rotary cutter



May 21, 1929. I MlLLER 1,714,036

- RSTARY CUTTER Filed May 11, 1926 2 Sheets-Sheet l awvzutoz May 21,1929. F, P; MI LER 1,114,036

TTTTTTTTTT ER Patented May 21,1929.

, 1,114,036 ENTi OFFICE;

FRANK r. MILL R, or MEADVILLE, PENNSYLVANIA.

Romany CUTTER.

Application filed May 11, 1926. Serial N o. 108,294.'

This invention relates to rotary cutters of the-inserted blade type andhas for an important object the provision of means whereby the bladesmaybe securely locked 1n place to resistithe tendency of the same. tomove with respect .to thecarrier whenin use.

Morespecifically, an important object of, the invention is to provide aninserted blade rotary cutter in which the bladesm'aybe posl- 1o tivelylocked against endwise-and edgewise shifting and in which wear may beeasily compensated for.

Other objects and advanta parent during u scription. I a

In the accompanying drawings forming a part of this application and inwhich like numerals are employed to designate like parts throughout. thesame,

- Figure l is a fragmentary perspective of an inserted blade rotarycutter constructed in accordancewith this invention; Figure 2 is afragmentary sectional taken on line 2-2 of Figure 1; V Figure 3is asectional view taken on line 3+3 of Figure 2; j I

1 Figure 4 is a fragmentary perspective of a slight modification of theinvention;

Figure 5 is a detail longitudinal sectional view through theinserted'blade rotary cutter, one of the blades being shown inelevation; I v Figure dis a fragmentary transverse sectional viewthroughthe rotary cutter illus trated in Figure 4; j I s Figure 7 is agroup perspective illustrating one of the blades and associated parts bymeans of which the blade is supported and heldinplaceu' I ges will bethe course of the following deview In the drawings, the numeral 5designates a carrier havin longitudinal grooves for the reception of bades 6. By reference to Figure 2 it willbe seen that'each groove is moreor less uniformly decreased in width toward the periphery of the carrierand that the blade received therein is'also decreased in width towardthe outer'edge thereof so that when the blade is forcedoutwardly by ameans to be described it will have wedging contact with the walls of thegroove andwill, therefore, be held firmly in place. In other words, eachblade is wedge-shaped in cross 'section and is adapted for'wedgingengagement with the-wallsof the groove whereby the outward movement ofthe blade is effectively limited.

In carrying out the invention, a tapered key 7 is positioned between theinner edge of each blade and the bottom wall'of the groove andwhen'advanced, asshown in Figure 3,

will forcethe blade 6 outwardly into wedging on contact with the wallsof the groove, as previousl stated. Thus when the blade has been firm ylocked in place by the tapered key a 7 edgewise movement of the bladeispositively prevented as a result of the strain to which the cutter issubjected in use. j r

a The longitudinal thrust on each blade is taken bya locking screw 8,the rear portion of which has threaded engagement with an angularlyextended opening in thecarrier; The rear'portion of the locking screw 8may be provided with suitable tool engaging means accessible withoutdisturbing any other parts of the carrier. The forward portion of thelocking screw 8 is selectively received in notches 9.in the blade 6 andhasrfirm en gagement with't-he wallof one of the notches to holdthe'bl'adc against endwi'se'movement.

Figure 2 clearly illustrates that the'forward terminal of the pin 8is'tapered' to a point and is adapted for binding engagement with theadjacent portion of the tapered key 7 to hold the tapered key againstendwise movement when the samehas been adjusted. Of course, thetapered'key 7 is adjusted previous to the engagement of the screw 8with'the same- Hence it will be seen that'the locking screw 8 not onlytakes the longitudinal thrust on the blade 6, but also has bindingengages ment with thekey 7 to hold the same positive: ly in place. l'

It is believed to be obvious that the cutting diameter of the cutter maybe varied by longitudinal adjustment of the blades'6, inwhich case thescrews 8 are temporarily removed. In the form'of invention shown in Fiures 4 to 7 inclusive, the carrier is designated y the numeral 15 and isprovidedwith a plurality of grooves 16 for the reception of blades 17.The blades, of course, have conventional or other cutting'edges, thisfeature forming no part of the Present invention; In carrying out theinvention, oneside Wall of each groove 16 is inclined and the other sidewall of the groove is provided with separate faces 18 and19; arranged inintersecting planes 'for'engagement by the opposed faces of a wedge 20and a taper pin 21, respectively; Figure 7'p1ainly illustrates that'thewedge 20 is decreased-inthickness'toward the outer edge thereof so thatwhen the same is forced outwardly the wedge will have binding engagementon one side with the wall 18. and on the other side with the blade 17whereby the blade is securely and positively held in place.

It might be said that the taper pin 21 is provided with a beveled outersurface 23for contact with the face 19 of one side wall of the groove sothat when the taper pin is advanced it will force the wedge 20outwardly. Particular attention is directed to the fact that the pin 21when advanced'not only. exerts an outward pressure on the. wedge 20.,but also has pressure contact with the'adjacent side of the blade 17whereby to cooperate with the wedge in, firmly holding the. blade inplace.

The, end thrust on each blade may be taken by a series of pins 26extended through an.- gularly directed openings 27 in the body of thecarrier. The openings 27 intersect the grooves 16. at thebottom wallthereof. as shown in Figure 6 so that it is the interme diate portionsof the pins 26 which have. engagement with the pins 27. The end portionsof the, pins 26. are firmly anchored in the openings 27 so that theintermediate portions of the pins 26 may offer the maximum resist: anceto the end thrust on the blades. The pins 26 are selectively. extendedthrough diagonal notches 29 in the beveled surfaces 3.0 of the blades sothat the end thrust on' the blades is taken by the pins.

In summarizing the form of invention shown in Figures 4 to 7, inclusive,itmight be said that the same. consists of a carrier having groovesandthat one sidewall of each groove is substantially V-shaped incross-section for engagement by separate wedging members which act tofirmly hold the blades against edgewise movement and that. the bladesare positively held against longitudinal movementby means of separatepins employed for that purpose.

While the. invention has been shown as especiallyjapplied to millingcutters, it is obvious that the inventive. idea involved may becarriedyout in connectionwith milling cutters, reamers,tool-holders forlathes, counter borers, and the like.

Having thus described the invention, what is claimed is: V

1. A rotary cutter comprising a body having a groove, a blade in thegroove, a key tohold the blade in place, and a screv. Cill'llGh solelyby the body and having intersecting locking engagement with the bladeand being in pressure. contact with the key to hold the same in place.

2. A rotary cutter comprising a carrier having a groove, a blade inthegroove and having a notch, 'a key engaged with the blade to hold thesame in place, and a locking device extending entirely through saidnotch to hold the blade against shifting and having the forward terminalthereof in pressure engagement with said key to hold the key in place. iY

3. A rotary cutter comprising a carrier having a groove, a blade in thegroove, a key having wedging engagement with the inner edge of the bladeto force the same outwardly, and a locking screw having secureengagement with saidblade and said key to hold both of these parts inadjusted position.

4.. A rotary cutter comprising. a. carrier having grooves decreased inwidth toward the periphery of the carrier, blades in said grooves andbeing decreased :in width toward the outer. edges thereoii forbindingengages ment with the. side walls. .ofthe. grooves, keysengagedwith said blades to force the. same outwardly, and lockingdevices engaged with said bladestoholdithe. same. againstlongitudinal'movement, the forward portions. of said locking devicesbeing tapered and hav-. ing pressure engagement with said keys. to hold.the. same. against longitudinalv movement.

5. The construction set forth inclaimt i, said blades being providedwith notches selectively and zsnugly receiving. portions of saidlockingdevicest Y i v r 6. A rotary cutter comprising a. carrier havinggrooves graduallydecreased in width toward the periphery of; thecarrier, blades received in said grooves and being decreased in widthtoward the outer. edges. thereof and having beveled surfaces provided.with notches, and locking, screws carried. by. the body and selectivelyextended through said grooves. and engaging the walls. of thosame tollOldl said blades against longitudinal movement...

'7. A rotary. cutter. comprising a.v carrier having grooves graduallydecreased in width toward the periphery of the'carrier, blades receivedin said grooves and being decreased in width toward the. outeredgcsthereof and having notches, locking screws. carried solely bythe bodyand selectively extended through said notches. tohold said. ades. aainst movement, and Wcdging mcansto torce said blades into pressurecontact with thewalls Of said grooves. 1 a r A. rotary cutter c mprisinga carrier having grcovcsdcc eased iuwidth oward. he periphery of: the.carrier, blades. received in i grcovcsand being dec ea ed in widt towardthe outer edges thereof and havingbew eled surfaces provided withnotches, locking screws carried bythe body and seleotively extendedthrough said notches and engaging the walls of the same to, hold saidblades against movement, wedging means to force said blades intopressure contact with the walls of said grooves, saidlocki-ng screwshavingpressure contact wit-h'said wedging means to hold the same firmlyin place.

9. A rotary. cutter comprising aparrier 7 ing a groove, a blade in thaving grooves, the walls of which converge, blades received in saidgrooves and having converging side walls adapted for flatly con tactingwith the walls of the grooves, wedging means to force said blades intobinding engagement with the walls of the grooves, and locking'screwshaving threaded engagement with the body and engaged with said bladesand having their forward portions tapered and in pressure contactwithsaid ,wedging means.

10. A rotary cutter com rising a body havlie groove. a wedging key tosecure the blade in place, and a fastening screw carried by thebodyandhav- 15 11. In a rotary cutter, a body having a 20 gr0ove,a pair ofmembers in the groove, anda locking screw carried solely by the body andhaving interlocking engagement with one of the members and havingpressure engagement with the other'member to hold both 25 of the membersin place.

In testimony whereof I afiix my signature.

FRANK P. MILLER.

